Keyboard



FIG. 1 is a top plan view of a keyboard showing my new design;

FIG. 2 is a right side elevational view thereof, the left side being identical in appearance; and,

FIG. 3 is a reduced top front and right side perspective view thereof, the keyboard being in place within a computer shown in broken lines for illustrative purposes only and forming no part of the claimed design. 

The ornamental design for a keyboard, as shown and described. 